Salazar said Cain, who won the 1500-meter run at the 2014 USA Indoor Championships, “took two weeks off from running to let the leg heal.” He added she was cross training after just a week.

Cain released a statement in early March explaining why she would miss the World Championships. The statement said, “Over the past week, I developed a discomfort in my lower leg. I had an MRI scan on Saturday and it was clear, but I still feel the pain when I wear spikes and have decided not to risk making it worse in Poland.” Cain was considered a medal prospect in Poland.

In 2013, after a winter and spring of smashing scholastic and junior records, Cain made the final of the 1500 at the World Outdoor Championships in Moscow.

She was having an outstanding 2014 indoor season before the calf issue arose. She set the world junior indoor 1000-meter record with a time of 2:35.80, and an American junior indoor mile record of 4:24.11.

Cain, a Bronxville, New York, high school student who turns 18 on May 3, might open her outdoor track season at the Drake Relays in Des Moines (April 23-27) or at the Payton Jordan Invitational at Stanford one week later, Salazar said. He is taking into consideration the importance of her final weeks as a high school student.

“We’re trying to fit in races around her AP tests and proms,” Salazar said.

She won’t be racing at the Oxy High Performance in California on May 15. She has two AP tests scheduled for that day.

Salazar said the Prefontaine Classic on May 31 is a “definite” for Cain, and her European track campaign will likely end in Monaco on July 18.

Cain is scheduled to start classes at the University of Portland on August 25.